> We could talk about taking from the rich, but actually the rich don’t consume all that much in aggregate, so that doesn’t help much (wealth and income don’t matter for this purpose, only consumption).
This is certainly what traditional economics says (they consume, rather than invest) because it's what rich people want us to think, but it doesn't hold out.
For one thing, their private jets and charter flights eat up a lot of fuel. Their lifestyles aren't free.
Second, attribution is a hard problem. When all the poor people drive to work in offices in places chosen by rich people, to create surplus value for the rich, who is consuming all that gasoline? Is it the rich, who benefit from this economic system and the poor being forced to participate? Or is the poor, who are the ones directly buying and using the fuel? Hard to say; at the individual level, attribution is probably impossible.
Third, the whole notion of "poors consume; the rich invest" is only true in proportionate terms. Sure, the billionaires don't directly consume 100,000 times as much as average people--simply because that would be ridiculous. No one can eat 100,000 hamburgers for lunch. But they do consume 100-1000 times more than average people--fuel is a big one, and those 20,000-SF houses aren't cheap to maintain--and this adds up. Their footprint on resources is bad enough; their overuse of land is destructive--this kind of private wealth is a catastrophic misallocation of resources.
Finally, what tends to happen with the rich is that they don't put their money into direct consumption (because, again, there's no hedonic payoff to having 100,000 hamburgers for lunch; 99,995+ will go to waste) so much as they use what they have to further secure personal and familial advantages, both economic and political. That's what this investment is: the configuration of society by the last round's winners to ensure they'll win the next round. This has resulted in an economic system that benefits them and keeps the middle classes comfortable enough to survive but--you're right on this--is unsustainable.
You're absolutely correct to say that "hit the rich" is far from sufficient here. We in the middle class are going to need to sacrifice. Thing is, no one's going to sacrifice anything with the current upper class in charge. Would you give up anything for these people and the society they've built? I sure wouldn't. You can't ask people in the middle classes to eat less meat and fly less often if you're taking a private jet to Davos. Neoliberalism has a lot of problems, but a big one is that these WEF people have literally none of the moral authority on which they seem to believe they operate.